Basic Technology

Injection molding technology involves the injection of molten plastic into one or several cavities via a hot-runner system (melt-channel distribution system) and rapid cooling of a preform to a low temperature. At this point the freshly manufactured article can be ejected from the cavity. In multilayer technology, more than one plastic resin is injected into the cavity.

The different resins are molten in separate injection units, conveyed in separate hot-runner channels, under pressure and high temperature, to an injection nozzle, which is the gate area for the molten plastic, into the cavity.

This injection nozzle consists of an outside and an inside tube. Both plastic streams are brought together after being released from the nozzle and they bond together because of a high pressure (up to 300 bar) and a high melting temperature (see Figure 1).

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